ΔE 16.6, loose: different enough that you should pick on purpose. UK Azure Blue is noticeably lighter, more saturated, warmer than Intermediate Blue FS35164.
Not as a straight swap; see the closer alternatives below. Loose match (ΔE 17). UK Azure Blue is noticeably lighter, more saturated, warmer than Intermediate Blue FS35164.
The same difference applies the other way round: Intermediate Blue FS35164 is noticeably darker, more muted, cooler.
ΔE is the colour difference between our two swatch estimates: under about 6 is close, over about 15 is loose. Real paints also differ in finish, coverage and how they thin, so test before you commit.
See Intermediate Blue FS35164 on the colour wheel See UK Azure Blue on the colour wheel
All matches: Intermediate Blue FS35164 equivalents · UK Azure Blue equivalents